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Original Caption Released with Image:

NASA's Mars Exploration Rover Spirit took this panoramic camera image of the southeast rim of Gusev Crater on sol 68. Like the more recent image acquired on sol 91, it captures the crater wall as it descends into the mouth of the Ma'adim Vallis channel. The martian skies were dustier when this image was taken, making the crater rim more difficult to see. The sky appears "noisier" than in the sol 91 image because the panoramic camera was operating at a higher temperature.

The same modifications were applied to this image as were applied to the sol 91 image to make the crater rim more visible.